I used to have some old hunting magazines that showed Brnos fitted with the scope that I referred to.
Couldn't find the magazines so googled and came up with what I was talking about.
I got it wrong regarding the two turrets on top being elevation and windage though.
Turns out that windage is done at the mount, and one turret is for elevation and the other is internal focus.

Try this link.

http://czechpistols82792.yuku.com/topic/...pe.html?page=-1